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CurrencyValidator.cs

using System.Globalization;
using FluentValidation;
using Nop.Core.Domain.Directory;
using Nop.Services.Localization;
using Nop.Web.Areas.Admin.Models.Directory;
using Nop.Web.Framework.Validators;

namespace Nop.Web.Areas.Admin.Validators.Directory;

public partial class CurrencyValidator : BaseNopValidator
{
    public CurrencyValidator(ILocalizationService localizationService)
    {
        RuleFor(x => x.Name)
            .NotEmpty().WithMessageAwait(localizationService.GetResourceAsync("Admin.Configuration.Currencies.Fields.Name.Required"))
            .Length(1, 50).WithMessageAwait(localizationService.GetResourceAsync("Admin.Configuration.Currencies.Fields.Name.Range"));
        RuleFor(x => x.CurrencyCode)
            .NotEmpty().WithMessageAwait(localizationService.GetResourceAsync("Admin.Configuration.Currencies.Fields.CurrencyCode.Required"))
            .Length(1, 5).WithMessageAwait(localizationService.GetResourceAsync("Admin.Configuration.Currencies.Fields.CurrencyCode.Range"));
        RuleFor(x => x.Rate)
            .GreaterThan(0).WithMessageAwait(localizationService.GetResourceAsync("Admin.Configuration.Currencies.Fields.Rate.Range"));
        RuleFor(x => x.CustomFormatting)
            .Length(0, 50).WithMessageAwait(localizationService.GetResourceAsync("Admin.Configuration.Currencies.Fields.CustomFormatting.Validation"));
        RuleFor(x => x.DisplayLocale)
            .Must(x =>
            {
                try
                {
                    if (string.IsNullOrEmpty(x))
                        return true;
                    //let's try to create a CultureInfo object
                    //if "DisplayLocale" is wrong, then exception will be thrown
                    var unused = new CultureInfo(x);
                    return true;
                }
                catch
                {
                    return false;
                }
            })
            .WithMessageAwait(localizationService.GetResourceAsync("Admin.Configuration.Currencies.Fields.DisplayLocale.Validation"));

        SetDatabaseValidationRules();
    }
}